Emotet Office (OOXML) / .XLSX malware analysis — malicious · 9df3bf857cfef183

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000

MD5: 821df352c6b19b508c67d867f5e5e2af SHA-1: 292a514979b7989f646648aa8e38ecb0d4c3f941 SHA-256: 9df3bf857cfef18398e6f19a15f7c587922c69e25ecf981df23e87957ef25abb

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The file is identified as malicious by ClamAV and exhibits high-confidence heuristics for VBA macros, specifically a Workbook_Open event and CreateObject calls. The DOC BODY reveals obfuscated commands that reconstruct a batch file and a VBScript, likely for downloading and executing further payloads. The reconstructed command line includes multiple URLs, indicating a downloader functionality. The VBA script itself is heavily obfuscated, but the presence of Workbook_Open and CreateObject strongly suggests malicious intent, likely to initiate the download process.

Heuristics 5

ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12041 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `2ab494f63a0954442d16caef4a41d0fd7fde01452af4c5e712cff90018032534`	vba-project	OOXML VBA project: xl/vbaProject.bin	42496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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